Giant Bear: Simus
Episode: 1x01 | Airdate: Aug 19, 2007
Season 1
Giant Shark: Megalodon
Episode: 1x02 | Airdate: Aug 19, 2007
Sabertooth: Smilodon
Episode: 1x03 | Airdate: Aug 19, 2007
Killer Wolf: Dire Wolf
Episode: 1x04 | Airdate: Aug 19, 2007
Terror Bird: Titanis
Episode: 1x05 | Airdate: Aug 19, 2007
Killer Pig: Archaeotherium
Episode: 1x06 | Airdate: Aug 19, 2008
Razor Jaws: Hyaenodon
Episode: 1x07 | Airdate: Oct 12, 2009